@@ -1967,6 +1967,14 @@ typedef struct AVCodecContext {

      * - decoding: unused

      */

     int scenechange_factor;

+

+    /**

+     *

+     * note: value depends upon the compare functin used for fullpel ME

+     * - encoding: set by user.

+     * - decoding: unused

+     */

+    int mv0_threshold;

 } AVCodecContext;

 /**

@@ -896,7 +896,8 @@ static always_inline int epzs_motion_search_internal(MpegEncContext * s, int *mx

         CHECK_CLIPED_MV((last_mv[ref_mv_xy][0]*ref_mv_scale + (1<<15))>>16,

                         (last_mv[ref_mv_xy][1]*ref_mv_scale + (1<<15))>>16)

     }else{

-        if(dmin<h*h && ( P_LEFT[0]    |P_LEFT[1]

+        if(dmin<((h*h*s->avctx->mv0_threshold)>>8)

+                    && ( P_LEFT[0]    |P_LEFT[1]

                         |P_TOP[0]     |P_TOP[1]

                         |P_TOPRIGHT[0]|P_TOPRIGHT[1])==0){

             *mx_ptr= 0;

@@ -739,6 +739,7 @@ static AVOption options[]={

 {"partp8x8", NULL, 0, FF_OPT_TYPE_CONST, X264_PART_P8X8, INT_MIN, INT_MAX, V|E, "partitions"},

 {"partb8x8", NULL, 0, FF_OPT_TYPE_CONST, X264_PART_B8X8, INT_MIN, INT_MAX, V|E, "partitions"},

 {"sc_factor", NULL, OFFSET(scenechange_factor), FF_OPT_TYPE_INT, 6, 0, INT_MAX, V|E},

+{"mv0_threshold", NULL, OFFSET(mv0_threshold), FF_OPT_TYPE_INT, 256, 0, INT_MAX, V|E},

 {NULL},

 };

@@ -793,6 +794,7 @@ void avcodec_get_context_defaults(AVCodecContext *s){

     s->frame_skip_cmp= FF_CMP_DCTMAX;

     s->nsse_weight= 8;

     s->sample_fmt= SAMPLE_FMT_S16; // FIXME: set to NONE

+    s->mv0_threshold= 256;

     s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;

     s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;